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Do I have the required hardware to get a VoIP or Telephony solution going?

Posted on 2004-09-28
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Last Modified: 2010-04-12
Hello Everyone
     I am fairly new to the VoIP movement so please treat me as a 4 year old in pre-k. I am interested in better understanding what kind of hardware we are missing in my enviroment to go wit a VoIP (SIP based phones) solution.

We have 7 locations, with 6 Full T1 point2points coming into my main location.

At the main location we have our internet router
Cisco 1751, a pix515 firewall, then we have a 3725 routers (this is the router where all trafic gets routed to, all 6 locations)

at each remote location we have cisco 1721 routers
and all our switches are cisco catalyst

We are looking to go with a Cisco Call Manager solution but interested in know if my hardware is capable of handling the load of VoIP on my network. thanks for your answers
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Question by:jterrero
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by:peteysa
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It sounds like you are in good shape, as all of the routers you mentioned, as well as the Catalyst switches, will support voice prioritization.  Unlike a download or file transfer, in which it doesn't really matter if the speed varies during an exchange, voice packets must arrive in order, and be available one behind the next, so that you do not get drop-outs or echoing on your call.  By ensuring end-to-end prioritization for your call, you make sure those voice packets get through first, no matter what other applications may be trying to hog the bandwidth at the time.  As the traffic from VOIP is pretty light (per call), this won't have much affect on the speed of data transmissions, either.

As your hardware is able to support prioritization, and your point-to-point lines are controlled by you (as opposed to flinging traffic over the public internet and hoping it makes it to the other side in time), you have the infrastructure you need to build a successful VOIP deployment, and are already bypassing some of the biggest pitfalls which cause user dissatisfaction with VOIP.  Make sure that when you do the roll-out, the necessary configuration is done at both the switch and router levels to take advantage of this.
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